Wrong object position after unity import
I believe in Unity Y-axis face upwards, while in Blender it's Z-axis. So it makes sense if your object rotates that way (thought it depends what options you use while exporting from Blender, there are options for Forward and Up axis). I would check rotations on all 3 objects in Blender and apply them if they are not at 0 (Object->Apply->Rotation).